@techreport{oai:jaxa.repo.nii.ac.jp:00005986,
 author = {清水, 幸夫 and Shimizu, Yukio},
 month = {Nov},
 note = {The Electron Cyclotron Resonance (ECR) microwave discharge Ion Engine System (IES) onboard Hayabusa has been operated in deep space. IES consists of four pair of ion thrusters and neutralizers on a rectangle shaped gimbals plate. Each engine has an exhaust nozzle of 10 cm in diameter and three grids made of Carbon-Carbon composite material. Weight of 66.2 kg Xenon propellant was loaded in a titanium alloy tank of 51 liter in volume before the launch of Hayabusa in April 2003. ECR microwave discharge generates Xenon plasma, and electric static field of 1,500 volts accelerates Xenon ions to over 30 km/sec exhaust velocity. Each engine generates thrust of 8 mN, specific impulse of 3,200 seconds, and consumes 350 watts of electric power. During the three-year flight operation, IES generated a delta-V of 1,400 m/s while consuming 22 kg Xenon propellant. The total operation time of IES is 25,900 hours. IES successfully propelled Hayabusa to the asteroid Itokawa on September 2005. During the three-month period, in-site activities such as scientific observation of Itokawa and collection of asteroid sample materials were carried out. Now Hayabusa is cruising on the Itokawa orbit waiting for the time of departure. IES is ready to propel Hayabusa back home to the Earth. IES will be operated again in early next year and Hayabusa will arrive to the Earth in middle of 2010., 資料番号: AA0049500002, レポート番号: JAXA-SP-06-006},
 title = {小惑星探査機はやぶさと電気推進機},
 year = {2006}
}